高频电介质新材料Ba_2Ti_3Nb_4O_(18)陶瓷  

New high-frequency dielectric material Ba_2Ti_3Nb_4O_(18) ceramic

作　　者：童盛[1] 凌志远[1] 郭栋[1] 胡星[1] 

机构地区：[1]华南理工大学材料学院电子材料系特种功能材料教育部重点实验室,广东广州510640

出　　处：《电子元件与材料》2007年第7期42-45,共4页Electronic Components And Materials

基　　金：广东省科技厅工业攻关资助项目(2001A1060302)

摘　　要：采用氧化物固相反应法制备了理论密度达96、8％以上的Ba2Ti3Nb4O18高频电介质陶瓷。XRD和SEM分析表明：该陶瓷为两相混合结构，主晶相为单斜Ba2Ti3Nb4O18相，次晶相为六方Ba2Ti3Nb4O21相。1250℃／2h烧结瓷体Ba2Ti4Nb4O21相的体积分数为5％-8％，1MHz下的介电性能为：εt约为38，tanδ约为1,6×10^-4，ac约为-8．51×10^-6/℃。Ba2Ti3Nb4O18 high frequency dielectric ceramics with 〉96.8 % theoretical density were prepared by the conventional oxides solid-state reaction method. The XRD patterns and SEM analysis indicate that Ba2Ti3Nb4O18 ceramic is a diphasic mixture, monoclinic Ba2Ti3Nb4O18 is the major phase, hexagonal BaaTi4Nb4021 is the minor phase. In Ba2Ti3Nb4O18 ceramic sintered at 1 250 ℃ for 2h, the volume percent content of Ba2Ti4Nb4O21 was 5 % - 8 %, the dielectric properties measured at 1MHz were： εr is about equal to 38, tanδis about equal to 1.6×10^-4 and ac is about equal to - 8.51×10^-6/℃.

关 键 词：无机非金属材料 高频电介质陶瓷 Ba2Ti3Nb4O18 介电特性 

分 类 号：TM534[电气工程—电器]